Malicious PDF — malware analysis report

Static analysis result for SHA-256 a041790cd60df699…

MALICIOUS

PDF

81.8 KB Created: 2021-03-26 16:51:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ee4571d7d72b5812c1c2e84024bd2349 SHA-1: 4754eba649a4a8cedb344f6a7381ef2c4440c1e8 SHA-256: a041790cd60df699798b95ee1b4e0e55a138c61bd86533c1a0e9ce0a3e53898d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, contains references to a game application, suggesting a lure. The presence of numerous external URIs, including one pointing to zajinet.ru, indicates potential phishing or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://zajinet.ru/123?utm_term=candy+crush+game+application PDF link annotation
    • https://bazubipevudupu.weebly.com/uploads/1/3/4/8/134876407/gakeg_lagejulavuxeto_fopaj.pdfIn PDF document text
    • https://cdn.sqhk.co/vitimosugu/xIgcsha/deck_eleven_railroads_mod_apk_revdl.pdfIn PDF document text
    • http://xubixaxar.22web.org/79408432887.pdfIn PDF document text
    • http://gotosutafizal.iblogger.org/18389680668.pdfIn PDF document text
    • https://sufepupebesi.weebly.com/uploads/1/3/4/6/134636280/lalegireno-bubopebuta-beweriwa.pdfIn PDF document text
    • https://cdn.sqhk.co/todusukiraxi/P9Jigie/rust_camera_setup.pdfIn PDF document text
    • http://dukafufuxona.iblogger.org/app_server_error.pdfIn PDF document text
    • https://cdn.sqhk.co/niripakexad/ibhezic/rulufedizulokomerimi.pdfIn PDF document text
    • http://vojituvidur.iblogger.org/jaravepurifor.pdfIn PDF document text
    • https://cdn.sqhk.co/kizewetete/SIHh1ac/94316814494.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zakunafu/gdpr_breach_reporting.pdfIn PDF document text
    • https://571cbd0a-ba82-408d-be6d-2df53a8fcfe5.filesusr.com/ugd/02af14_31c4f7e203e3400baa5a657d5ca199ca.pdf?index=trueIn PDF document text
    • https://63dbeab4-18c6-4677-a808-17cd77aec119.filesusr.com/ugd/963d80_c9720e3e9fd740d09f4494d05565d9e5.pdf?index=trueIn PDF document text
    • http://pufonivumase.epizy.com/vowafep.pdfIn PDF document text
    • https://93dbb2ad-f1e8-4c6c-adfd-2ef134399473.filesusr.com/ugd/df4650_3db36bcf20d543cda05a5d55c0cefb97.pdf?index=trueIn PDF document text
    • http://dakunexafabeve.epizy.com/the_hitchhiker_short_story_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/27897013427.pdfIn PDF document text
    • http://gowobubovojot.epizy.com/femagubimef.pdfIn PDF document text
    • http://tunazafagid.epizy.com/exultet_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/sigiwevogoredeka.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/fleischner_society_criteria_guidelines.pdfIn PDF document text
    • http://moxurux.epizy.com/training_tracker_excel.pdfIn PDF document text
    • https://2d130471-2a64-48ba-87cf-8f1e86c6acad.filesusr.com/ugd/9c43ec_04cc0f330d8c473c842888eefb6a7d85.pdf?index=trueIn PDF document text
    • http://mabobasator.epizy.com/najisedisag.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1C 5496 bytes
SHA-256: 9b31b2a60f773f060661ef4afb5a31a885abee5f2e1cfabe4602b4b46db9d15a
font_01_sfnt_off000111aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AA 12164 bytes
SHA-256: 9e0379a1c6a98103b606d40c54a830ac86e610cbbea891cf0b5e793125f0e666

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